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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9b981f26a125b00abea10a48dd19ead97424f657fadd94ec305ca23d32c807' 
  AND token = 'jwhstHRHgtx7jxY6sKf1JHUKGx8YNfdDejMDL6IZLUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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