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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a410672806b45a7ffb2e37ba6436c209adcc313b7f12158b59ef4ddb4c7f5432' 
  AND token = 'T4SO5Gdbl4ab7vgBLkNUGc13BK8DFCTWXTdpOx89r9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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