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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090ab0fbb0d58941fd2847cf0937a5d8d780d96f3010bb0f0d38e57ba9ba8669' 
  AND token = 'T7fky4LXnQWbtahrF6wFmkdjJy4+yd5OrpqGVQ6Pr0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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