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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c29a37fea9ae084a2467ef3b0c5a75df3591dfb3926a88d1a4c543967860638' 
  AND token = 'dwkQm43QYwZgZw3LdsihBstlAoUbEF1Rtgvmh5j8Q3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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