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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd4b638e85b47e0f87d8741c792b04191dc64eb041ee7b3726aebedb6eb504e' 
  AND token = 'V+ugmFyKhb8AcunrplfCF2/zHqdiON7VovYcf+CR3vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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