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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79fda829d57b014ca721ea5365f12b18f4b2a6e5ddc6fbf0115c5c5812116981' 
  AND token = '8DtE4LbeHLGCVZ8zlsnk117+bT5kGxgitnnq8mwmHgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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