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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0adae13ad1c5327a80e3e8123fc09c949b0acffa745085d589d887beb45e3ba' 
  AND token = '2Ykvp3u7fT/9H1mW2d7PYmZ4shGefY+bycj5+YuunqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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