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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da0cf419e7aceffc04bb0a254ada6bcfa3dab844e09d49703a68c3e4bc05ef3' 
  AND token = 'exEEHxLZb2CSbrS+hWA3X2kJUnDy6VrQPt6PnS5bkY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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