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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7cb2e0e02661e6ac6cf19a4bbb812562c449226a99cb358eb08289618d2143' 
  AND token = 'W8iHmFZ0bsSKksBX0TLGNRmS+sdfj/bh2xv12MTr52E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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