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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fb675a8e7cd559447845a4ac65c9225a0b6efe59e8f6c146cabe7ff50a9117' 
  AND token = 'NbtNn3oPmz/8W6MWRwV5E6YxK5qrh/uwqhOsFZdfesY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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