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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de99b0d15b2b428f842cf4f956fa7b6204e486b9a3d1bfc98aa2c9b98f0bf08' 
  AND token = 'Tiq6wqaWMr1rL5lBvnGhJ32HhpO3I+I9OdSKeD5BN48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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