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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9e1b53b5113f6ad1f777362d941fc6f29de592feacafb94df41833b5241376' 
  AND token = 'sFiZloEsrkNma6lCfe0wNg8smlzgZilGdfHf3h0YhsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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