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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c2de4fff4cce6dd9c788f6317258f25ed9eb8d9b254832a043befd454bbf91' 
  AND token = 'yWgwzE3BlYX7wSY4YAQt6b3dqNCgm1so8PfOf1WLu3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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