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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7689133956b0fbecb320fd71a26e78268ffca275d59f70f182dca904701d13' 
  AND token = 'J2QZMMdYiY5vRupG31aFUGfz0JruviNjZQuk8DojwEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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