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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6911669c6fed0f6225fb74e35d5e0a92c93bdcc039f27bb07fa5d29c55d1b880' 
  AND token = 'PtJ7PaaHuxXDGte0YUtndia6tR2GPb2BqwKiiMj0BQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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