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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e08b4a0ca86de220f90c6f2a7e903d383423ad245550ffe15c7856b0873dff8' 
  AND token = '21HOkvSkd8JUtmweEkX1vzsk8DejxjPiK35qncjEq/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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