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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003c0772aea91c512afe9f3f1cc4d915f47b22fad01fc5122d08122f9cc2ae93' 
  AND token = 'ts8g89bCNsK7jPEpolOAqRDVlYqOPxGep1ckWGQykxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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