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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970090f9c49614e352202382019340967800d9b299fabc9db5458f34d482c7a8' 
  AND token = 'D+A4STLS9uUxVMtFioxpVen2m7unElItnFKc094rKA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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