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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994adca0fd7171f5d85244969867848bbfffb790c1470e1e1259a0c21ad466c9' 
  AND token = 'OEfrl7ncK/oUvGnZkdIU0XLpGRAmRgXsl0/jn/G3z7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}