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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7980bcf0c5e3fa92470feeae9a1a53e6f3fefec049c38d9ed3ca8660e2af5e5d' 
  AND token = 'CZRG9bk2Y1WYHw2xwN7jpO4DThDozJaY5jQURob3A9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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