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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979a3b04d7986b26f2c9300914761cdaa66153ff0de566fddfd4283126e95b00' 
  AND token = 'repe3E9ajY9te2xrrF3Kt4rq9whNe+3K/kNBWcCRuzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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