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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae192e2c3c2f07c475b1f3a15c21e96a0729610a573059acfd7d463507e35ba2' 
  AND token = '0zSwmyo8mgpxF4PnJ3OEn2anFDFggWXOUbM1XaRhT7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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