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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc394cb4ef2db1dc9f2a6c2823cc5eeb01622cf25db0ad5567d643b3d06300af' 
  AND token = '9xpfZmG+fLZm7WHke+kdwA2TqG8uY7ilnmo5JNYo92g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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