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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c8ae7d8e5bc9896f443b259520529ca1537db4b2382616fa179983e9c9af6d' 
  AND token = 'mUOpn6zweR6iC8TvODAUA66BXkoJq4kJZSEz78+3VtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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