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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562a15b48cfdeaf2d82fe42a6a034881cba5fbdbd071a4ee0d926af1616bdab2' 
  AND token = 'eej6b7kRY6mU1vID0Df6ej8EiDzxHySrhjOswfr13rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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