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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026be93eac302a8ced4fe11e9516c45787dea6ac37aa20fe249e1da84a6bf889' 
  AND token = 'uHNp3V2TUbgokpK5acOHVkksoK5wKyafzYVc4wZ0upo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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