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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b6c46a53dd735a42aa457afff9abc979e3623e82d358d4371d8794f2696127' 
  AND token = '5R4imuyVaOaYl8Xu4h4ghC0/Y1raOORjQFFA6VEjgCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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