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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9469607fd6d2ecac602188e24246b9b1d6d1773de61b50af254d6b9f24efeef0' 
  AND token = 'r8wOAgl/BgtOhFJbDrn6uumcJt4/FeA+NQkbbmqYh0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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