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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b983f98aae287e9d955c0e8e656e900f58b1ada88c979b9f00ccbeab929092dc' 
  AND token = 'qpehLs/xBYygQSIIe81GGnGE6Rqy2v+MapxFfxSwZFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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