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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139f452f8fd7ee386d80c728de874404f21ea156c31dd7b8e801bf92ccd6114c' 
  AND token = '9SEwMQOw6r18ds0EusjCUHElT8f2eE4PHhAp48OB6Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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