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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fadaac22c53d2345abd170ebd95d36e976dd8b9fb14a6b25deed75d797fbd494' 
  AND token = 'W9aqmGcAMHR9B5F37FBkHqFMJhpzYq6ASdrP994hZJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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