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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e55c39ad6e6f39ace2c5342c4e071b4ccfd2cd28c69b91082f13a67039f1234' 
  AND token = 'qyofrefp1MfOBaG+xdOeENNsKg6WX9DlPBG3fWvys+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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