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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77519228b732ab8b4d0824cad7d9ba19e1b37bed60e44c866b735ba5c3f7d1f' 
  AND token = 'y7XMCIZA9v/uPu3UOG8vJ32YgUXuuyoyce31uzrddBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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