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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4061d982d17bc2a4d547b055bc51dec64d5c2a7ac25f9f2ffab5d9f2cec24408' 
  AND token = '0H20+LBZ85V8mGz/XJ+7zZTO8IGkD/aJFIv+x6Vo2ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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