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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a5e0ecf7e20fbba6fea02763e639f42fc4dd29892a40bc2bc1a942c64674fd' 
  AND token = '3OW+llEM0jaTZSdjP8UzmaBsviA+gzXpebHGsCa7828=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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