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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7840c753d54822c67308fb095efa45aba9e90b97054f3e66d4af24c3ac67242a' 
  AND token = 'j4e9CtKaoKyEia2hBNrDF+uB3jInb0hSQ+BI31oXGcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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