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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09107b57d2acd00a2b327f7fc644a19179cde2f02acfb80070b746bef1173da0' 
  AND token = 'hMjTX0y1s/ReoD+GmfQ9Dxx7NOzHO84CuOJsN62kWcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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