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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a93ce139a298e8dc095ee035cfcb43a26a3463f560d431717ad90348268796d' 
  AND token = 'hi9lQkBgoF/QQYP8K9jq38LfFsRWCb/06aG0jx+T6qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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