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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74f6e58aa8eaa7e575e1d062847c500656c71d3eb302ecb2542c4156adefcba' 
  AND token = 'dIeLWwcBg/kerDoEbXMSEC8wepza3WJIpBkgbV/iDfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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