Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba48a1dc6a6b52079ddfebbb2b759d3a1c4ac0c089515cbe74a388410a0c500' 
  AND token = 'C8XyvLJcso+XE4nFWaTgmLTL4GqSfdhG7z3/TIrz+K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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