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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2e53a9b6e1f008c075b6ec4d3188f99b794e66e21cebb7e6c144b97dbc4313' 
  AND token = 'IyWL2AOy8s6cOTtbk9eDygg9EXah/zoxHgi7jd3e2vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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