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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df36798bcb1cc3b7a00e25e0a711e3433a5e6f55b55132ec70bb43b998aa95e' 
  AND token = 'llb2k/tRUdareJBX6n2ZwU5O7YlNRiRTkJEr/SMsL0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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