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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ce6f8d5ee37390f55ef7c77741c6a4a02a8366049bcd9103d70694c9d10a85' 
  AND token = 'Yl1JUEoMFWa/Dt2vPd3Wnne9Ke/9wiupgdbwf3b8EYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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