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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01ade7c65f084ec2566e5b4c8754cad40713a8ef08de48dca448f5dab4490ad' 
  AND token = 'TbV5Xar8hElC23nN8hxJ9ZYEqkrGfzhCRx1hOBhjI/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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