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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2714df9d9b0474945b529a9ce17326ae3ebfe074a7d04c8d2f06d0aefaa21fc1' 
  AND token = '5SEI7yKraj0jm3/xEyaDrQktboeG+b7ADtn9ZrWM10A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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