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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d896e1ac5cbc95fd093dad96c6e5ef27e62dfc70b653638e8e2d1a0de721c3b' 
  AND token = 'q9FqZAHILeQBY4SZ6HreOh6lhfaVq3Il0eLzptDQoDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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