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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923d684329f77a9ac34b87cf0bb311a6e247700688e063271a4765e62bdfd726' 
  AND token = '/YfKRemsSWOTE1ys1rWUb9V45iCj6ZWtFh9B7wYd3tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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