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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4a5883052c96e7aa761294258e23a27d36cce354f9acf3d0f9336e5d7178f9' 
  AND token = '2duUHxYwVOHZfB32KvZ6oBWh154CAhe+kiG7+7vINiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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