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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977b7e765a3ec8bcc49a3f08b0ccceb5d0cbe1c60381e42643357c10722a77e3' 
  AND token = 'HwefpEdJQY6JDwknRtwrsT0JPJ62F8ofhaWCMbhogKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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