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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5de8198e477b69c1eced7ddb8d0f12a3e0f2528aa51caeb83215818a7bb299' 
  AND token = '0OaUgDT4qtoA4k8fkCu0USIgUnKkaOm0B92QL/FXhI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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