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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fa24519b3ed030c3e1b59d7d90b9ee21ca841db8d66201193be23601b756fa' 
  AND token = 'ydBD6fge6ztMc3NqQyXNGH5MSFf8j44VTYPo4MkkAKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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