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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b983c3272481f7637877fb96152b2ced6314f3e18e52a19a5c5a104184c6fdf' 
  AND token = 'X7xDBj6kGyFHTp8+Kdk6eck1tv8f8r3tK9JHIlXc1y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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