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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0922ec3d07b10bf01444a8b4552561415be8541f266a995733138b42b2c102f' 
  AND token = '3bE9+hPq4Y98Efn2KtkoVVgOS2ZxwI7TTKOZIyYJdPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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