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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f94cf40c0cb4c1ec40d9146da08df314e5220b65246d38a84a2a1f60c541dc' 
  AND token = 'xxcmaASQcVCdykoPbO5Axj27Lt3sEhSRlsMgBatdGbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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