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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ce831be9282e6bf6d653d82f93605f82d217bc4dce73af8320805e6d57dbb7' 
  AND token = 'apdCguzI9wMjF9ym1tqLSMK1Fvx1Qok0zTe5QmLx1+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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