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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e33f919f990423d0c49fe8e40125744cb65a404fb6d37296408796ab8fcb851' 
  AND token = 'nCs9AZLIIplyRiLgTu8mul1o6UUegkEvEF1I/qBcN6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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