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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30fee7a258d548aa53d37a5a46f5d65759c9c9c22083452e5275639bad1889f4' 
  AND token = 'AzKRCT/0LtvSgYBY5ER9sSe8MTUPdwG2QpEeEXK/BxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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