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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c10fc90d30f4574ed0fef4494d60e3ed97ebf7977886e8c391a7ec589b284b' 
  AND token = 'blZNB9S4lu1d54KaYOUPtOm6B00ReEcxIElkGwKo3fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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