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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a18b0834db1402005841b502b5fdd3cbafb23d60b61f761c198c84d1608ee7b' 
  AND token = 'nKMbTlEx/qWsA5cjMWbIKdUtdur3+r4mwRCIo3kfxpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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