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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e713705bc0060d213522fb5f47432db9493a57ff33953ab0a35d8bc7b1cbc9' 
  AND token = 'uakyk3FuD1RZBvrlceD6Til86DV3nj7HP6tdo4EuiKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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