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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62efab335816fe771da3ef2cd18afb65f9e590361051f1b51c97f00b50bbaaf1' 
  AND token = 'kkJcUUchyEwWPpI032NlCQknp6SyF2jJmwcTOE2Lvl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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