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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c204c206c676b57fa259f3777c6de611e9e1ac6b49cf289f68cbe0ec71d902b1' 
  AND token = '6vzKCxAZ1QTvGKWwwirAt1MZ4/JSK2kcYD9TCqXFr6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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