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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c84cbc0345700fe1100dbbbcfc5760ede1252b31d6ca72df750a7170f622a4' 
  AND token = '0rbct8VpEcL9Px75UHx/jqRhlRY1W6kaQ0gHUO7t7us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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