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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2a2896359cf56d6aad323083ea8d99cfdc743ca6513c29a9f4f14b2866b2de' 
  AND token = 'BV50j0uWz5FT3pCqvRPJm4ysP3zFoC03cDU3Kc7abLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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