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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c228c1bba2d256f5d32efce8547be106bc0a674ac9f8ad729e39f321d85914' 
  AND token = 'qOhlWf2AErHNSkNJefU6g8sSGTPkJncqNQtX64p17Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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