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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ad7dae13089079f59bf475255c4d53912cbbc3eead514a2fc67d506b5cdd83' 
  AND token = 'J7IMULbBAhYst/46sh6qaUNEhqWfh1UHhMbnltVRShI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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