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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ed76764c7d317a958b81f3cc35f8568e0d6043b877b5e98f23b44a9ca165c7' 
  AND token = 'QlSBLPnjqJHVWdBYyh7D1r0YLtm7nOjSAVwYMbVWA4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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